Re: [PATCH] blkcg: add plugging support for punt bio

[Jens Axboe]

On 8/6/20 7:54 AM, Xianting Tian wrote:
> Try to merge continuous bio to current task's plug fisrt.

The patch looks fine to me, but I'd really like to see a bit more
changelog here. The commit message should explain why the change
is made, rather it's a very brief explanation of what it does.

If the bio list is contiguous, then we do the plugging to improve
merging at the lower level. You probably ran into a case where
you saw sub-optimal merging? And now the performance is better
with the patch? How much?


-- 
Jens Axboe